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#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <time.h>
#include <string.h>
#include <map>
#include <vector>


#ifdef ENABLE_LOG
        void printFormatted(const char* format, ...);

        #define LOG(TAG, ...) {\
                        char buffer[256];\
                        time_t now = time(0);\
                        struct tm* timeVal = gmtime(&now);\
                        strftime(buffer, sizeof(buffer), "%Y-%m-%d %H:%M:%S", timeVal);\
                        printFormatted("%s| %s:%d: %s ", buffer, __FILE__, __LINE__, TAG);\
                        printFormatted(__VA_ARGS__);\
                        printFormatted("\n");\
                }

        FILE* initLogIfNecessary() {
                static FILE* fp = NULL;
                if(fp == NULL) {
                        fp=fopen("log.txt", "a");
                        if(fp == NULL) {
                                fprintf(stderr, ("Unable to open log file.\n"));
                                return NULL;
                        }
                        printFormatted("Compiled on %s %s\n", __DATE__, __TIME__);
                }
                return fp;
        }

        void printFormatted(const char * format, ... ) {
                FILE* logFile = initLogIfNecessary();
                va_list args;
                va_start (args, format);
                vfprintf (logFile, format, args);
                va_end (args);
                fflush(logFile);
        }
#else
        #define LOG(TAG, ...)
#endif


void helloWorldFunction() {
	printf("HelloWorld\n");
}

#define MAX_NUM_OF_FIELDS 500000

typedef struct {
        unsigned long long currentHeight;
	int count;
} fieldStruct;

void fillFieldStruct(fieldStruct* fs, int growSpeed, unsigned long long currentHeight, int numFieldsGrowFaster) {
	//fs->growSpeed = growSpeed;
	fs->currentHeight = currentHeight;
	//fs->numFieldsGrowFaster = numFieldsGrowFaster;
}

void updateFieldStructInfo(std::vector<int>* fieldTypes, std::map<int,fieldStruct*> * fieldsMap, int newFieldType) {
	std::map<int, fieldStruct*>::iterator it = fieldsMap->find(newFieldType);
	LOG(__FUNCTION__, "entering function");
	fieldStruct* fsPtr;
	if(it != fieldsMap->end()) {
		fsPtr = it->second;
		fsPtr->count ++;
	}
	else {
		fsPtr = (fieldStruct*)malloc(sizeof(fieldStruct));
		fieldTypes->push_back(newFieldType);
		fsPtr->count = 1;
		fsPtr->currentHeight = 0;
		(*fieldsMap)[newFieldType] = fsPtr;	
	}
	LOG(__FUNCTION__, "leving function");
}

void fillMap(std::map<int,fieldStruct*> * fieldsMap, int* growSpeedArr, int numberOfFields) {
	int i = 0; 
	fieldStruct fieldInfo;
	fieldStruct* fsPtr = NULL;
	std::vector<int> diffFields;
	
	for(i = 0; i < numberOfFields; i++) {
		int speed = growSpeedArr[i];
		updateFieldStructInfo(&diffFields, fieldsMap, speed);
	}
}

unsigned long long computeSia(unsigned long long daysOfGrow, unsigned long long heightDiff, unsigned long long fieldSum, int numOfFields) {
	return ((fieldSum * daysOfGrow) - (numOfFields*heightDiff));
}

unsigned long long computeFieldSum(int numberOfFields, int* growSpeed) {
	int i = 0;
	unsigned long long result = 0;
	for(i = 0; i < numberOfFields; i++) {
		result += growSpeed[i];
	}
	return result;
}

unsigned long long processCut(unsigned long long daysOfGrow, unsigned long long finalHeight, std::map<int,fieldStruct*>* fieldInfo, int numberOfFields, int minGrowSpeed) {
	LOG(__FUNCTION__, "called with daysOfGrow=%llu, finalHeight=%llu, numberOfFields=%d", daysOfGrow, finalHeight, numberOfFields);
	int i = 0;
	unsigned long long sum = 0;
	for(std::map<int, fieldStruct*>::iterator it = fieldInfo->begin(); it != fieldInfo->end(); it++) {
    		int speed = it->first;
		fieldStruct* fs = it->second;
		fs->currentHeight += speed * daysOfGrow;
		long long diff = fs->currentHeight - finalHeight;
		if(diff > 0) {
			LOG(__FUNCTION__, "diff greater equals %llu for  currHeight[%d]=%llu",diff, i, fs->currentHeight);
			fs->currentHeight -= diff;
			sum += diff*fs->count;
		}			

	}
	return sum;
}

#ifndef UNIT_TEST
int main(int argc, char* argv[]) {
	int numberOfFields, numberOfCuts;
	int growSpeed[MAX_NUM_OF_FIELDS];
	int minGrowSpeed = 10000000;
	unsigned long long currHeight[MAX_NUM_OF_FIELDS];
	memset(currHeight, 0, sizeof(currHeight));
	scanf("%d %d", &numberOfFields, &numberOfCuts);
	LOG(__FUNCTION__, "read numberOfFields = %d, numberOfCuts = %d", numberOfFields, numberOfCuts);

	int i = 0;
	for(i = 0; i < numberOfFields; i++) {
		scanf("%d", &(growSpeed[i]));
		LOG(__FUNCTION__, "Scanned : growSpeed[%d]=%d", i, growSpeed[i]);
		minGrowSpeed = minGrowSpeed > growSpeed[i] ? growSpeed[i] : minGrowSpeed;
	}

	std::map<int, fieldStruct*> fieldInfo;
	
	fillMap(&fieldInfo, growSpeed, numberOfFields);

	unsigned long long startingDay, startingHeight;
	startingDay = 0; 
	startingHeight = 0;
	unsigned long long cuttingDay, finalHeight;	
	for(i = 0; i < numberOfCuts; i++) {
		scanf("%llu %llu",&cuttingDay, &finalHeight);
		LOG(__FUNCTION__, "Scanned cuttingDay:%llu, finalHeight:%llu", cuttingDay, finalHeight);
//		unsigned long long result = computeSia(cuttingDay - startingDay, finalHeight - startingHeight, fieldSum, numberOfFields);
		unsigned long long result = processCut(cuttingDay - startingDay, finalHeight, &fieldInfo, numberOfFields, minGrowSpeed);
		LOG(__FUNCTION__, "Computed result = %llu", result);
		printf("%llu\n",result);
		startingDay = cuttingDay;
		startingHeight = finalHeight;
	}		
}
#endif