Calculate the cumulative sum of the array and store it in another one, that is to say, accumulated[i] = sum of numbers of the array up to ith index. This can be computed in O(n). Then for a query, the answer will be accumulated[r] – accumulated[l]. This is O(1) solved Competitive programming: “Time exceeded error”
The page is not bogus. However, the code referenced per the link provided is actually Java, as the site refers to the ImageJ program, an “Image Processing and Analysis” Application. See here. solved In function main: undefined reference to exec [closed]
You do not have execute permissions for your executable. Use chmod +x ./secondo first to correct this. This question gives more detail. solved When I try to execute this code using ./secondo I am getting this error
The error says it all. Trying adding -std=c++11 or -std=gnu++11 to the compiler options in your NetBeans IDE. I’ve not used Netbeans but see this link where a snapshot of build variables is shown and that is where you need to add the compiler options. 1 solved gcc 4.7 Give me error message
Short answer: no, GCC can’t use Keil generated .o or .a files reliably. While they may be using the ABI (arm binary interface), GCC and Keil almost certainly rely on different libc implementations and can have references to functions that the other toolchain doesn’t provide. Also, the debug information may not be compatible (see the … Read more
From GCC manual: -O3 Optimize yet more. -O3 turns on all optimizations specified by -O2 and also turns on the -finline-functions, -funswitch-loops, -fpredictive-commoning, -fgcse-after-reload, -ftree-vectorize, -fvect-cost-model, -ftree-partial-pre and -fipa-cp-clone options. No of these optimizations are particularly unsafe. The only optimization that I see can change the result is -ftree-vectorize. In some cases, using vector instructions … Read more
Let’s split this into parts: $ is a character indicating that the shell is ready to receive a command. It is not part of the command. gcc is an executable executing the GNU C compiler from the GCC toolchain. test.c -o demo are arguments supplied to gcc. The GCC toolchain is only available natively for … Read more
It has to do with operator sequencing. What the compiler thinks you’re doing is (a ? b = 3 : b) = 4 which obviously is incorrect. Instead, why not put the b on the left side, and get only the value to assign using the conditional expression, like b = a ? 3 : … Read more
You should try to use valgrind. Valgrind is a debugging tool only requiring for your code to be compiled with the -g flag. It’s the best way to spot segmentation fault over a program, or any memory leak. Think about using valgrind options while debugging (it’s at the bottom of the valgrind report) something like … Read more
When you call round() with double agrument you actually call: double round(double x); from <cmath> not your version hence the error. If you rename your function error would be gone without cast. Yet another reason to avoid using namespace std. 1 solved C++ function returning wrong data type
You can declare global variables but you have to initialize inside main like this: char* vidmem; char* vidmem; int main() { vidmem = (char*)0xb8000; vidmem[0] = ‘x’; vidmem[1] = 0x0f; } 1 solved Can’t use global variables with gcc
Yes, for gcc5.x and later specifically, that specific expression is optimized very early to just p, even with optimization disabled, regardless of any possible runtime UB. This happens even with a static array and compile-time constant size. gcc -fsanitize=undefined doesn’t insert any instrumentation to look for it either. Also no warnings at -Wall -Wextra -Wpedantic … Read more
Looks to me as though you’re running remove_if on a range of 100 characters since size is 100, but the “homebrew” runs until you find the nul terminator (which is only 10 characters in). Dealing with that using the change in your comment below, on GCC with -O2 I still see a difference of about … Read more